A double wedge cut was used to improve the cut effects in the medium-depth hole blasting of rock roadways. First, the cavity formation mechanisms of single wedge cut and double wedge cut were analysed theoretically. The results show that the cavity formation resistance of the second-order wedge cut is reduced by the first-order wedge cut. Second, simulations of the two cut modes were conducted, which visualize the stress wave evolution and indicate that the stress wave of the first-order cut holes can cause pre-damage to the rock mass in the second-order cut cavity. A comparison of the stress field distribution shows that the first-order cut holes significantly increase the stress field intensity within 0 ~ 1.6 m to enhance the failure of the rock mass in the first-order cut cavity. Hence, the rock mass in the first-order cut cavity can easily be thrown out to create a new free face, which reduces the clamping effect of the second-order wedge cut and exacerbates the tensile failure of the rock mass in the second-order cut cavity. Thus, the difficulty of second-order wedge cut is reduced. Finally, blasting experiments were performed in a rock roadway. Using the double wedge cut, the average footage increased by 0.31 m, the average utilization rate of blastholes increased by 12.4%, and the average specific charge decreased by 0.20 kg·m⁻³, which proves the superiority of this cut mode.

使用双楔形切口来改善岩石巷道中深度爆破中的切口效果。首先，从理论上分析了单楔形和双楔形的空洞形成机理。结果表明，一阶楔形切口降低了二阶楔形切口的空腔形成阻力。其次，对两种切割模式进行了模拟，可视化了应力波的演化过程，并表明一阶切割孔的应力波可对二阶切割腔中的岩体造成预破坏。应力场分布的比较表明，一阶切孔在0〜1.6 m范围内显着增加了应力场强度，增强了一阶切孔岩体的破坏。因此，一阶切割腔中的岩体很容易被抛出，从而形成一个新的自由面，从而降低了二阶楔形切割的夹持效果，加剧了二阶切割腔中岩体的拉伸破坏。因此，降低了二阶楔形切割的难度。最后，在岩石巷道中进行爆破实验。采用双楔切，平均进尺增加0.31 m，炮眼平均利用率提高12.4％，平均比电荷降低0.20 kg·m 爆破实验是在岩石巷道中进行的。采用双楔切，平均进尺增加0.31 m，炮眼平均利用率提高12.4％，平均比电荷降低0.20 kg·m 爆破实验是在岩石巷道中进行的。采用双楔切，平均进尺增加0.31 m，炮眼平均利用率提高12.4％，平均比电荷降低0.20 kg·m⁻³，证明了这种剪切模式的优越性。